Spraying apparatus for dental, medical, and like purposes



. 5, 1939. w. BREWER SPRAYING APPARATUS FOR DENTAL, MEDICAL, ANDLIKEPURPOSES Filed Sept. 22,' 1937 2 Sheets-Sheet l Lge/far L//Mm'rewerDec. 5, 1939. 2,182,742

sPnA'YiNG APPARATUS Fon DENTAL, MEDICAL, AND LIKE PURPOSES W, BREWERFiled sept. 22, 1957 2 Sheets-Sheet 2 Patented 5, 193.9

2,182,142 srnAmG APPARATUS non DENTAL, MED- ICAL, .LIKE PURPOSES WilliamBrewer,jU pper Edmonton, England, asl signor to Sparklets Limited,Westminsten England, a British company Application September 22, 1937,Serial No. 165,215

In Great Britain December 9, 1936 i claim.

'This invention relates to portable spraying apparatus lof the kind suchas is used in dentistry and medicine for the purpose of discharging inspray form under pressure a dentifrice,medica l ment or the like in theform of aliquid-or solution. The invention particularly relates to appa'ratus of the type described in the British PatentA No. 392,433, dated asof October 13, 1932, the saidapparatus comprising a vessel for contain-1 0 ing' the solution to be sprayed and a lhead re- `movably secured tothe upper end ofthe vessel.

A capsule (of .the kind known under registered trade-mark as Sparklet)containing-gas under pressure, such as carbon dioxide, is carried in 5 aholder screwed onto the head and isl adapted to be pierced by a hollow'piercer in the head,4 when the holder is screwed up, thereby toliberate i the gas. The liberated gas passes through passages in thehead and thence into the vessel 2'0 Where it acts to force the solutionup a tube 1 .and through a valve-controlled passage in the head. Thevalve is controlled by a hand lever which operates against the action ofa spring and which when actuated permits-passage of the t solution to anoutlet pipe removably secured to the. headand provided with a sprayingnozzle.

In the `said British Patent No; 392,433, the whole of the gas from thecapsule is liberated at once into the vessel and in order to preventliability of the vessel bursting under the pressure of gas, means areprovided for creating an airj lock space which ensures that', whencharging the vessel with solution, the latter cannot extend beyond apredetermined level and a suflicient 35 space is left for the expansionof the liberated gas fromthe capsule. y l

VWhere, as in this arrangement, the whole of the gas isinitiallyliberated into the vessel, the

pressure of the-ejected `solution lgradually de 40 creases'as it is usedand, further, the air lock space lrequired. necessitates alarger vesselforv a givenjquantity'of -solution than would otherwise vbenecessary,v"Y l The objects ofthe present invention are to provide means forobviating undue strain on the vessel by the liberated gas and forensuring that the force of the streamof' solution ejected is as, uniformas possible throughout the period from the piercing of the capsule toitsexhaustion. 'I'he present invention consists in a spraying apparatuscomprising a container forl solution or the like, a head removablysecured to the said container, 'a holder for a capsule containing apressure medium and a nozzle both secured to the said head, and amanually voperable valve between the container and the nozzle, whereinthere` is provided an auxiliary valve between .the capsule-andthecontainer which is operable independently of the main valve by means ofan actu' ating handle projecting through the head. 5

'I'he apparatus is provided witha manually operable valve, arranged at apoint between the gas container or capsule and the vessel,.for contro1`.ling the passage of gas liberated from the capsule to the vesselcontaining the solution to be sprayed. 10 s A lever capable ofmanipulation by a nger ofv the operator is secured to the stem of thevalve and a coil spring is arranged around the stem for maintaining thevalve closed and for re-- turning it to its closed position afteractuation; 1 5 By the provision of this valve, which is situated in.the'head of lthe apparatus, the gas from the pierced capsulejcan be`admitted to the vessel in small Aquantities s oas to ensure uniformityof pressure of the solution sprayed from the noz- 20 zle and toavoidundue strain on the-vessel.

.The further advantages are attained that first thesolu'tion is notejected too forcibly but the degree of pressure of the issuing spray canbe regulated to suit individual requirements, secondly the ves- 25 selcan be charged to its full capacity with the solution and need be of nogreater dimensions than necessary for this purposeand thirdly gas fromthe same capsule (provided it is not exhausted) can be utilised for afresh charge of'ao solution or for different kinds of solution since the;vessel may be replenished by unscrewing it from the head withoutliberating any gas 'otherthan that' which has been Aadmitted' past thegasv control valve. f 351 -The invention will now be more particularlyvdescribed with reference to the accompanying drawings which`show inFigure ly an elevation partly in section of'an apparatus of the typedescribed in British Patent No. 392,433 and pro'- 40 vided witha-sui'table construction of means in yaccordance with this invention. Al

` -Figure 2 is; a side elevation of the head with,

`the holder and nozzle removed; i

Figure 3 is a view a't right angles to Figure'Z; 45;

'Figure 41is a view corresponding to Figure 2 but showing the partsinsection and Figure 5 is a view at right angles to Figure 4 andcorresponding to Figure 3 but shown partly in-section.. A 50 Referringto the drawings, I is a'vessel onto z v jwhich is screwed a head 2carrying .twotubes'l3 and 4' which project into the .vessel to pointsadjacent lits base. The solution in the vessel is expelled through thetube 3 and the gas from the capsule is conveyed to the lower part of thevessel through the dip tube 4. VA screw-threaded socket 5 is provided onone side of the head and its adapted to receive a holder 6 for a capsule'I containing gas under pressure, for example carbon dioxide, the holderacting, when screwed up on the socket, to-force the capsule onto ahollow piercerl 9 whereby the gas is liberated into a passage I in thehead. From this passage the gas passes through branch passages II and I2and thence into the dip tube 4. l

The branch passage I I is controlled by a screw,- dowri valve I3,mounted in the head, the stem of which projects beyond the casing of thehead and has a lever I4 which can be manipulated by a linger of theoperator for the purpose of operat ing the valve I3.. To ensure againstleakage of gas around the stem of the valve I3, a stuiilng box nut I5 isprovided which when screwed up acts by its conical inner end to force a.packing I6 tightly against the stem of the valve. A coil spring I'I isarranged around the stufng box I8 of the valve, one end engaging thevalve lever I4 and the other end entering into a slot I9 in the head 2.To open the valve the lever is. moved vin a rotary direction andoperates against the action of the spring, the strength of the latterbeing such as to permit only slight opening of the valve and to causeits return onto its seating after the release of the lever by theoperator.

The valve assembly may readily be dissassembled by removing the springwhen the valve stem and the stufling box nut are then free to beunscrewed from the head.

In order to operate the apparatus, the head is unscrewed and therequired liquid or solution poured into the then open neck of the vesselI and the latter then'screwed onto the screwed boss 8 of the head. Acapsule is placed in the holder and the latter screwed up to eiectpiercing of the capsule by the piercer 9 whereupon the gas is liberatedinto the passages I0 and II. Beyond this point no passage of gas ispermitted until the valve I3 is operated and this is eilected at thediscretion of the operator who may allow only small quantities at a timeof the gas to pass into the vessel I by a rapid actuation and release ofthe lever I4. 'I'he pressure of the expanded gas in the vessel I thenforces the solution up the tube 3 and into a passage 20 in the headwhere it is prevented from passing into a branch passage 2|communicating with the outlet tube 22 by the valve 23. This valve 23 isactuated in opposition to a spring 24, by a lever 25, the actuation ofwhich raises the vvalve oi! its seating and allows the solution to passinto the outlet pipe 22 from which it issues in spray form through anozzle 26.

The outlet pipe is detachablev and is made capable of rotation for thepurpose of varying the direction of the spray.

It has already been proposed to provide a grooved screw-threaded memberin the passage between the gas container and the solution container inatomisers for medicinal and dental purposes, means if desired beingattached to the said screw-threaded member and extending through thesaid solution. container whereby the said member may be screwed inwardlyto close the said groove. A

-What I claim is:

In spraying apparatus comprising a container for solution or the like, ahead removably secured to the said container, a holder for a capsulecontaining a pressure medium and a nozzle both secured to said head, anda manually operable valve between the container yand the nozzle, theprovision of an auxiliary manually operable valve allowing direct ow orpressure medium from the capsule to the container which is operableindependently of the main valve by means of an actuating handleprojecting through and carried by the head in ysuch position that thesaid actuating handle is capable of manipulation by a ilnger of theoperator, a helical spring being arranged around the valve stem or thestuiiing box therefor, one end engaging the actuating handle and theother end engaging a stationary part, for example the head, of theapparatus for maintaining the valve closed and for returning itautomatically to itsclosed position after operation.

WILLIAM BREWER.

